System and method for battery charging with acoustic excitation

• US 5,932,991 A
• Filed: 01/28/1998
• Issued: 08/03/1999
• Est. Priority Date: 01/31/1997
• Status: Expired due to Term

• Current Assignee: Georgia Tech Research Corporation (University System of Georgia)
• Original Assignee: Georgia Tech Research Corporation (University System of Georgia)
• Inventors: Ding, Yi, Ahuja, Krisham K.
• Primary Examiner(s): Wong, Peter S.
• Assistant Examiner(s): SHIN, KYUNG E
• Application Number:
  US09/014,388
• Time in Patent Office: 552 Days
• Field of Search: 320/137, 320/147, 429/4
• US Class Current: 320/137
• CPC Class Codes: H01M 10/4214 Arrangements for moving electrodes or electrolyte
• CPC Class Codes: H01M 10/44 Methods for charging or discharging circuits for charging H02J7/00
• CPC Class Codes: H02J 7/0071 with a programmable schedule
• CPC Class Codes: H02J 7/00711 with introduction of pulses during the charging process
• CPC Class Codes: Y02E 60/10 Energy storage using batteries

Abstract

The present invention is a system and method for enhancing the charging of a battery by exposing the battery to acoustic excitation while the battery is being charged. By adding acoustic excitation to the charging process, the present invention reduces the time needed to charge the battery, reduces the energy needed for charging, and increases the battery'"'"'s cycle life. The present invention may be used to charge new and used batteries and to rejuvenate dead batteries.

Claims

1. A system for charging a battery having at least first and second electrodes, comprising:

a power source for applying electrical energy to the electrodes of the battery; and

a source of sound waves for subjecting the battery to acoustic excitation substantially simultaneously with the application of said electrical energy, wherein said source of sound waves is selected from the group consisting of;

an ultrasonic bath adapted to contain the battery during charging;

at least one air jet directed to impinge on the battery; and

a fluid container fabricated from a flexible material and enclosing a sound transducer, said fluid container being acoustically coupled to the battery.

2. The system of claim 1, wherein said fluid container is acoustically coupled to the battery by a coupling gel, said coupling gel being capable of enhancing the electrical and acoustical conductivity between said fluid container and the battery.

3. The system of claim 1, wherein said fluid container is fabricated from rubber.

4. The system of claim 1, wherein said air jet is a high-speed air jet.

5. The system of claim 1, wherein said system is used to rejuvenate a battery.

6. The system of claim 1 wherein said power source applies a charging voltage to the electrodes of the battery.

7. The system of claim 6 wherein said charging voltage is a constant voltage.

8. The system of claim 6 wherein said power supply applies a combination of constant voltage, constant current and pulsed current to the electrodes of the battery.

9. The system of claim 1 wherein said power source applies a charging current to the electrodes of the battery.

10. The system of claim 9 wherein said charging current is a constant current.

11. The system of claim 9 wherein said charging current is a pulsed current.

12. A method for charging a battery having at least first and second electrodes, comprising the steps of:

applying electrical energy to the electrodes of the battery; and

subjecting the battery to acoustic excitation substantially simultaneously with the application of electrical energy, wherein said acoustic excitation is supplied from a source selected from the group consisting of;

an ultrasonic bath adapted to contain the battery during charging;

at least one air jet directed to impinge on the battery; and

a fluid container fabricated from a flexible material and enclosing a sound transducer, said fluid container being acoustically coupled to the battery.

13. The method of claim 12, wherein said fluid container is acoustically coupled to the battery by a coupling gel, said coupling gel being capable of enhancing the electrical and acoustical conductivity between said fluid container and the battery.

14. The method of claim 12, wherein said fluid container is fabricated from rubber.

15. The method of claim 12, wherein said air jet is a high-speed air jet.

16. The method of claim 12, wherein said method is used to rejuvenate a battery.

17. The method of claim 12 wherein said applying step comprises applying a charging voltage to the electrodes of the battery.

18. The method of claim 17 wherein said charging voltage is a constant voltage.

19. The method of claim 12 wherein said applying step comprise applying a charging current to the electrodes of the battery.

20. The method of claim 19 wherein said charging current is a constant current.

21. The method of claim 19 wherein said charging current is a pulsed current.

22. The method of claim 12 wherein said applying step comprises applying a combination of constant voltage, constant current and pulsed current to the electrodes of the battery.